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A. Histological view of the soft tissue mass at the interface between the necrotic material (on the joint side) and inflammatory cells. Hematoxylin and eosin (HE), 40×. B. Enlargement of A with inflammatory cells consisting mainly of macrophages and lymphocytes along with plasma cells and eosinophils. HE, 200×. Several lymphocytic aggregates were observed at low magnification (panel C; HE, 40×) and at high magnification (panel D; HE, 200×).
